Transmitter and transmitter-arm connection.



No. 807,528. PATENTED DEC. 19, 1905. B. E. YAXLEY. TRANSMITTER ANDTRANSMITTER ARM CONNECTION.

APPLICATION FILED MAR.18. 1901. I

H I f I 1 m \AA E55 E5 W UNITED STATES PATENT OFFICE.

ERNEST E. YAXLEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN ELECTRICTELEPHONE COMPANY, OF CHICAGO, ILLINOIS, A COR- PORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed March 18, 1901. Serial No. 51,809-

To all whom it may concern.-

Be it known that I, ERNEST E. YAXLEY, a citizen of the United States,residing at Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Transmitter andTransmitter-Arm Connections, of which the following is aspecification.

My invention relates to telephone transmitter and transmitter-armconnections. In former devices difliculty has been experienced insecuring and maintaining a good electrical connection between thetransmitter cases or heads and their supporting-arms where such partsthemselves form a part of the transmitter-circuit and also in providinga simple, convenient, durable, and eflicient connection between theother terminal of the transmitter and the circuit-wire or conductor.

My invention has for its objects the provision of means for overcomingthese difiiculties and the construction of a transmitter head or casehaving devices for maintaining a good electrical connection with the armin a simple and convenient manner and also for making an effective andconvenient connection with the other side of the transmitter-circuit.

Other objects are the provision in such an instrumentality of meanswhereby the transmitter may be rotated to prevent its carbon packing andin which such electrical connections are maintained in whatever positionthe transmitter may be turned.

A further object is to provide an improved arrangement involving a splitcollar mounted on the end of a hollow swinging supportingarm and atransmitter having a boss or hub portion adapted to be clamped to saidsplit collar, whereby the transmitter is firmly secured in place and agood electrical connection established.

It is also an object to provide certain details and features ofimprovement tending to increase the general efliciency andserviceability of a transmitter and transmitter-arm construction of thisparticular character.

To the foregoing and other useful ends my invention consists in mattershereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is a vertical longitudinalsectional view showing the several parts of the apparatus. Fig. 2 is across-section of the arm and contained parts on the line 2 2 of Fig. 1looking toward the transmitter. Fig. 3 is a cross-section on the line 33 of Fig. 1, and Fig. 4; is a perspective view of the centralspring-contact of the transmitter-circuit.

In the figures, 2 is a transmitter-support or rocking arm, one end ofwhich is pivoted or otherwise secured in the usual way to theinduction-coil casing or other support, the other end being formed witha cylindrical or tubular portion 3, which is adapted to receive anannular flange or tubular boss 4:, formed integrally or as desired onthe back case or part 5 of the transmitter case or head. Theint-ermediate portion of the arm is preferably flat or oblong incross-section, as seen in Fig. 3, is hollow, and contains a covered orinsulated wire forming apart of the transmitter-circuit. Thiscylindrical portion 3 of the rocker-arm is slotted, as at 6, (see Fig.2,) preferably at one side of the axis, so that one part (the thinner)will spring more easily or be flexible, though it will be understoodthat other constructions could be employed to accomplish the same endsor more slots formed. In the slotted portions apertures 7 are provided.The apertures 7 in one of said portions, preferably the thicker portion8, are threaded and are adapted to receive screws 9, the'heads of whichare adapted to be seated in shoulders or notches 10, formed in saidcylindrical portion or enlargement 10 of said portion of the rocker-arm2. To prevent the transmitter head or case from coming out of the armwithout first entirely removing the screws, or nearly so, the said boss4 is provided with an annular groove 11, and the apertures 7 are solocated with reference theretov that the screws 9 engage therewith orlie therein when they are inserted. When the transmitter is in place andthe screws are securely tightened, it will be seen that the transmitteris tightly clamped and held from moving in any way, and in some aspectsof my invention it is obvious that this portion 3 of the arm may be ofany other desired cross-section. In some kinds of transmitters, however,it is considered desirable to turn the head or case to prevent thecarbon packing or for other purposes, in which case the cylindrical part3 permits such a rotation of the transmitter by properly adjusting thetension of the clamping-screws 9 to merely bind the parts together thatthe transmitter can be easily turned by hand. This provides a goodelectrical. connection between the parts, as well as a firm mechanicalconnection. The transmitter itself is provided with the usual mouthpieceand perforated web or diaphragm 12 and a front metallic cone 13, whichis secured by screws to the back case 5. The sound-receiving diaphragm14 is supported at its edge upon an annular flange or shoulder 15,carried by the cone 5, a washer of paper or other desired material beinginterposed between the diaphragm and the front case 13. At the rear' ofthe diaphragm and within the case 5 the rear electrode 16, of suitablematerial, is placed and hollowed out in its front side to provide aspace between it and the rear side of the diaphragm for the granules ofcarbon, as in the ordinary transmitter, and a washer or ring 17, of feltor other desired material, which may rest upon paper washers 18, beingplaced between the said electrode 16 and the diaphragm 14. A centralscrew 25 is passed through this electrode and is threaded intoa metalliccontact-pin 19, which is located within the said boss 4 and supportedtherein on an insulating-washer 20, seated upon the rear face or side ofthe casing 5. The electrode 16 is insulated from the rear case 5 bywashers 26, of suitable substance, and is held thereagainst by the headof the screw 25. The latter forms a firm mechanical connection betweensaid case, electrode, contact, and cooperating parts. terminal of thetransmitter, the powdered carbon being placed between the diaphragm andthe electrode, with its screw 25 in the hollowed portion of theelectrode 16.

The contact-pin 19 ispreferably formed with asharp point 21, which. whenthe transmitter is inserted engages a spring-supported circuit terminalor contact 22, which is seated in an insulating washer or cup-seat 23,placed within the cylindrical portion of the rockerarm at the junctureof the enlarged and restricted portions of said arm, and the wire 24 ofthe transmitter-circuit is attached in any desired manner, as in theaperture 30, to said spring-terminal 22. The latter is provided with ashoulder 27, upon which the coil-spring 28, surrounding its shank 29,bears, the said spring finding aseat in the bottom of the cup 23. Thetransmitter-circuit is thus completed through the arm 2 and itscylindrical portion 3, annular boss 4, and the rear casing 5 of thetransmitter, diaphragm 14, the carbon at the rear of the diaphragm,screw 25, and pin 19 'to the spring terminal 22 and circuitwire 24. Theend of contact 22 may be slightly hollowed, as shown. This constructionprovides a much better electrical connection between thetransmitting-case and supporting-arm than the ordinary set-screw and atthe same time permits the rotary adjustment of the transmitter-headtherein, as well The screw 25 also forms one' as its quick an easyremoval therefrom. The connection of the other terminal of thetransmitter with the circuit-wire has the advantage of nopermanently-connected wire, thus allowing a ready removal of thetransmitter and always maintaining a firm and perfect contact whateverrotary position the transmitter may take, there being no twisted wires,and, further, of being entirely inclosed within the arm to guard againstmechanical injury.

As far as I know, 1 am the first to provide a split collar which isformed integral with theend of the hollow swinging transmitterarm and toprovide a transmitter having a boss or hub portion adapted to be clampedin the socket of the said split collar, whereby both the mechanical andelectrical connections are established in a convenient and eflfectivemanner, the split collar being in the circuit of the limited thereto, asmany and various changes could be made therein and still come within thescope thereof; but

What I do claim, and desire to secure by Letters Patent, is p 1. Thecombination of a swinging arm provided at its distal end with a splitsocket, a transmitter provided with a grooved hub or boss adapted forinsertion in said socket, and a clamping screw extending through thesocket and the groove in said hub or boss all substantially as and forthe purpose set forth.

2. The combination of a swinging arm haying its distal end provided witha split socke't, a contact arranged in said socket, an insulating-cuparranged at the end of said socket, a spring interposed between thecontact and cup, a wire fastened to the contact and leading through theinsulating-cup to the pivoted end of said arm, a transmitter providedwith a grooved hub or boss and a terminal, the said hub or boss beingadapted to fit the said socket, and the said terminal being adapted toengage the said contact which is yieldingly backed by said spring, and aclamping-screw extending through said socket and a groove in said hub orboss all substantially as and for the purpose set forth.

3. The combination of a swinging hollow arm having its distal end formedwith a split socket, the insulated and yieldingly-supported contactinclosed by said socket, the transmitter having a tubular andexternally-grooved boss adapted to fit said socket, the said transmitteralso having a back electrode and a terminal held together by a screw, apair of clamping-screws extending through the socket and grooved portionof said boss, said yielding contact being adapted to engage saidterminal all substantially as and for the purpose set forth. a

4. The combination with a transmitter head or case having an annularboss, of a slotted socket-support in which said boss fits, and means toclamp said boss within the socket to provide a good electricalconnection therebetween, to prevent its withdrawal therefrom, and at thesame time permit its rotation all substantially as and for the purposeset forth.

5. The combination with a transmitter having an annular boss, of aslotted socket-support in which said boss fits, an annular groove insaid boss, a screw adapted to pass through said slotted portionsto'cause them to, bind the boss to provide a good electrical connection,and lying within the said annular groove to prevent withdrawal of thetransmitter all substantially as and for the purpose set forth.

6. The combination with a transmitter-case having a rearwardly-extendingannular boss, a transmitter-arm having a cylindrical socket for saidboss, the said socket being slotted and having screws passingtherethrough to clamp the same to the said socket, an annular groove inthe said boss in which the screws lie, whereby the transmitter-case maybe rotated without interference with its electrical connections allsubstantially as and for the purpose set forth.

7 The combination with transmitter-head, of a supporting-arm therefor,the connection between them permitting a relative rotation of the twoparts, a terminal carried by the head, a spring-pressed terminal carriedby the arm and having a concave contacting portion for said otherterminal so that the terminals are not easily misplaced allsubstantially as and for the purpose set forth.

8. The combination of a hollow transmitterarm having one end adapted tobe pivoted to a suitable support, the other end thereof being splitlongitudinally of its length to provide a split socket, a transmitterhaving its back provided with a portion adapted to enter said socket,and a clamping-screw extending transversely of the arm and the saidsplit therein and adapted for clamping the transmitter in the socket theside of the screw projecting into the bore of the socket allsubstantially as and for the purpose set forth.

9. The combination of a hollow transmitterarm having its end splitlongitudinally at two points in its circumference to provide a splitsocket, a transmitter having its back provided with a portion adapted toenter said socket, and a pair of clamping-screws extending transverselyof the arm and of the said splits therein, and adapted to clamp thetransmitter in the socket the side of the screw projecting into the boreof the socket all substantially as and for the purpose set forth.

10. The combination of a hollow transmitter-arm having its end splitlongitudinally to provide a split socket, a transmitter having its backprovided with a portion adapted to enter said socket, and aclamping-screw extending transversely through the split portion of thearm, said screw having a screw-threaded engagement with the arm at oneside of the split the side of the screw projecting into the bore of thesocket all substantially as and for the purpose set forth.

11. The combination of a hollow arm having one end adapted for pivotalconnection to a suitable support and having the other end thereofprovided with a socket which is split longitudinally, and aclamping-screw extending transversely of the split and thereby adaptedfor clamping a transmitter within the said socket the side of the screwprojecting into the bore of the socket all substantially as and for thepurpose set forth.

ERNEST E. YAXLEY.

Witnesses:

CHARLES C. BULKLEY, HARRY P. BAUMGARTNER.

